The WEBGL_multi_draw.multiDrawElementsWEBGL()
method of the WebGL API renders multiple primitives from array data. It is identical to multiple calls to the gl.drawElements()
method.
The WEBGL_multi_draw.multiDrawElementsWEBGL()
method of the WebGL API renders multiple primitives from array data. It is identical to multiple calls to the gl.drawElements()
method.
js
multiDrawElementsWEBGL(mode, countsList, countsOffset, type, firstsList, firstsOffset, drawCount);
mode
A GLenum
specifying the type primitive to render. Possible values are:
gl.POINTS
: Draws a single dot.gl.LINE_STRIP
: Draws a straight line to the next vertex.gl.LINE_LOOP
: Draws a straight line to the next vertex, and connects the last vertex back to the first. gl.LINES
: Draws a line between a pair of vertices.gl.TRIANGLE_STRIP
gl.TRIANGLE_FAN
gl.TRIANGLES
: Draws a triangle for a group of three vertices.countsList
An Int32Array
or Array
(of GLint
) specifying a list of numbers of indices to be rendered.
countsOffset
A GLUint
defining the starting point into the countsList
array.
A GLenum
specifying the type of the values in the element array buffer. Possible values are:
gl.UNSIGNED_BYTE
gl.UNSIGNED_SHORT
OES_element_index_uint
extension: gl.UNSIGNED_INT
offsetsList
An Int32Array
or Array
(of GLsizei
) specifying a list of starting indices for the arrays of vector points.
offsetsOffset
A GLuint
defining the starting point into the offsetsList
array.
drawCount
A GLsizei
specifying the number of instances of the range of elements to execute.
None.
mode
is not one of the accepted values, a gl.INVALID_ENUM
error is thrown. drawCount
or items in countsList
or offsetsList
are negative, a gl.INVALID_VALUE
error is thrown. js
const counts = new Int32Array(/* … */); const offsets = new Int32Array(/* … */); ext.multiDrawElementsWEBGL( gl.TRIANGLES, counts, 0, gl.UNSIGNED_SHORT, offsets, 0, counts.length, );
Specification |
---|
WebGL WEBGL_multi_draw Extension Specification |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
multiDrawElementsWEBGL |
86 | 86 | No | No | 72 | 15 | 86 | 86 | No | No | 15 | 14.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_multi_draw/multiDrawElementsWEBGL